Why do houses have shingles and slanted roofs, but most other buildings have flat tops?
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Despite what you think, all roofs are angled.
Slopes and shingles are a style choice, and work well over short distances. However, to achieve the same effect over large distances would leave you with a roof nearly as tall as the building itself.
When you have a large area, it is MUCH better to have a slight slope with tarp and gravel. The structure needs to be stronger but that issue starts with holding up a building that large anyways. A little more near the top to support the weight of snow is hardly an issue when you consider how much you save on large cathedral roofs.
TL;DR. They are not flat, they are slightly angled and use material that does well at that angle.
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